Everything about the eLeaf iStick is spot on (except one thing).
The form factor, battery life, appearance, display, and hand feel is perfect for me.
There is a GLARING defect that will not be evident for some vapers.....
I'm a low power vaper (please don't hate on me).
I vape 50/50 18 mg/ml at 3.7 volts using 2.5 ohm clearos. I get satisfaction using that combination, and EVODs and Protank 1s and 2s are my usual setup. Although I can't prove it with multimeter evidence, I am certain that the iStick DOES NOT STEP DOWN VOLTAGE. That's right, the display lies. I get burnt vapes on a fresh battery set at 3.7 volts, and the amount of vapor does not decrease when I set the voltage to 3.0 volts. Exactly the same taste and vapor. Normally, I can tell when my unregulated batteries fall below 3.7 volts (getting ready to shut down). Also, due to the large capacity battery, it stays above 3.7 volts for quite a while before settling in on the 3.7 volt part of the battery discharge curve. Once it gets there, it's great.
If you vape at 4.2 volts or higher, you'll never notice, and all will be fine in the universe. If you vape at 3.7 volts, this thing will overvolt your preferred power, and you won't be happy.
How hard would it have been to actually step down the volts??????
If they fix this defect in version 2, it will be perfect.
tldr:
iStick doesn't step down voltage, so be aware.